CN108109871A - Limit switch - Google Patents
Limit switch Download PDFInfo
- Publication number
- CN108109871A CN108109871A CN201711143372.XA CN201711143372A CN108109871A CN 108109871 A CN108109871 A CN 108109871A CN 201711143372 A CN201711143372 A CN 201711143372A CN 108109871 A CN108109871 A CN 108109871A
- Authority
- CN
- China
- Prior art keywords
- axis
- plungers
- button
- limit switch
- plunger
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H21/00—Switches operated by an operating part in the form of a pivotable member acted upon directly by a solid body, e.g. by a hand
- H01H21/02—Details
- H01H21/18—Movable parts; Contacts mounted thereon
- H01H21/22—Operating parts, e.g. handle
- H01H21/24—Operating parts, e.g. handle biased to return to normal position upon removal of operating force
- H01H21/28—Operating parts, e.g. handle biased to return to normal position upon removal of operating force adapted for actuation at a limit or other predetermined position in the path of a body, the relative movement of switch and body being primarily for a purpose other than the actuation of the switch, e.g. door switch, limit switch, floor-levelling switch of a lift
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H21/00—Switches operated by an operating part in the form of a pivotable member acted upon directly by a solid body, e.g. by a hand
- H01H21/02—Details
- H01H21/04—Cases; Covers
- H01H21/08—Dustproof, splashproof, drip-proof, waterproof, or flameproof casings
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H3/00—Mechanisms for operating contacts
- H01H3/32—Driving mechanisms, i.e. for transmitting driving force to the contacts
- H01H3/42—Driving mechanisms, i.e. for transmitting driving force to the contacts using cam or eccentric
Landscapes
- Push-Button Switches (AREA)
- Mechanisms For Operating Contacts (AREA)
- Rotary Switch, Piano Key Switch, And Lever Switch (AREA)
Abstract
The limit switch of the present invention can inhibit the abrasion of plunger.Possess：Switch portion (5), with button (51)；And plunger (4), there is the abutting part (41) for pushing button (51), abutting part (41) has on axle center compared with button (51) the smaller recess portion of diameter (411).
Description
Technical field
The present invention relates to the limit switches for possessing plunger.
Background technology
Limit switch is that switch portion is contained in the device in housing in order to be protected from the influence such as external force, water or dust
Part.As the limit switch, it is known to use the /V of cup-shaped plunger (カ ッ プ プ ラ Application ジ ャ) and OT (excess of stroke) plunger
Switch.
In the limit switch, when rotating swingle using operating body, axis is rotated with the rotation.Then,
Due to the rotation of axis, overcome the active force of helical spring and push cup-shaped plunger, similarly, also push OT plungers.Then, pass through
Push OT plungers, overcome helical spring active force and push switch portion button, switch portion close.
On the other hand, when the rotation for swingle is released from, the rotation for axis is also released from.Then, due to spiral bullet
The active force of spring, for cup-shaped plunger return to initial position, and due to the reset force, axis is also reset to initial position.Then, when
When OT plungers are released from from axis, due to the active force of helical spring, the push-button reset of switch portion to initial position, switch portion is beaten
It opens.Also, due to the reset force of the button, OT plunger returns to initial position.
Prior art literature
Patent document
Patent document 1：Japanese Patent Laid-Open 2004-247255 publications
The content of the invention
Problems to be solved by the invention
But in existing limit switch, OT plungers can be because wear with supporting the friction of the bushing of oneself.It is tied
Fruit is the worry for existing the failure that the reset that abrasion powder, waste residue etc. hinder switch portion occurs.In addition, OT plungers are due to switch
The reset force of the button in portion and return to initial position, therefore when larger with the frictional force of bushing, there are switch portions to reset
Worry.
On the other hand, if making the extension of OT plungers, frictional force will reduce.That is, by extending the length of OT plungers,
The thrust loading for being applied to bushing is reduced, so as to inhibiting to wear.But OT plungers are to determine that the action of limit switch is special
The important component of property, due to needing function as the absorption of length adjustment and OT, in the confined space of limit switch
The length for inside extending OT plungers easily is more difficult.
The present invention is made to solve the above problem, and its purpose is to provide a kind of abrasions that can inhibit plunger
Limit switch.
Technical means to solve problem
Limit switch of the present invention is characterized in that, including：Switch portion, with button；And plunger, have
The abutting part of button is pushed, abutting part has on axle center compared with button the smaller recess portion of diameter.
The effect of invention
According to the present invention, due to forming as described above, the abrasion of plunger can be inhibited.
Description of the drawings
Fig. 1 is the side cross-sectional view for the configuration example for representing the limit switch involved by embodiments of the present invention 1.
Fig. 2A~Fig. 2 C are the sectional views of the configuration example for the abutting part for representing embodiment of the present invention 1.
Fig. 3 is for illustrating the figure of the reduction reason of the frictional force of the limit switch involved by embodiment of the present invention 1, is from axis
Axis direction observation OT plungers figure.
Fig. 4 A, Fig. 4 B are the figures for the effect for illustrating the limit switch involved by embodiments of the present invention 1, and Fig. 4 A are represented existing
The figure of frictional force in some limit switches, Fig. 4 B are the limit switches (situation of Fig. 2A) represented involved by embodiment 1
In frictional force figure.
Fig. 5 represents the sectional view of other configuration examples of the limit switch involved by embodiments of the present invention 1.
Specific embodiment
Hereinafter, it is described in detail referring to the drawings for embodiments of the present invention.
Embodiment 1
Fig. 1 is the sectional view for the configuration example for representing the limit switch involved by embodiments of the present invention 1.
Limit switch is that switch portion 5 is contained in the device in housing 1 in order to be protected from the influence such as external force, water or dust
Part.As shown in Figure 1, the limit switch possesses：It housing 1, axis 2, cup-shaped plunger (reset plunger) 3, OT plungers (plunger) 4 and opens
Pass portion 5.
One end of axis 2 is projected into the outside of housing 1, and rest part pivotally accommodates within the case 1.The axis 2 exists
One end is formed with sawtooth portion 21, and the cam part 22 of plate is formed in the other end.In addition, it is connected in the sawtooth portion 21 of axis 2
The swingle (not shown) rotated using operating body.
Cup-shaped plunger 3 is the component for axis 2 to be made to be reset to initial position.The cup-shaped plunger 3 to be abutted with cam part 22,
And the direction of (comprising the meaning being substantially orthogonal) orthogonal with the axis direction of the axis 2 is pushed into the rotation of axis 2
Mode be movably accommodated in housing 1.In addition, cup-shaped plunger 3 is exerted a force by helical spring 6 to 22 one side of cam part.
OT plungers 4 are the components of the button 51 for push switch portion 5.The OT plungers 4 to be abutted with cam part 22, and
The side in the direction of (comprising the substantially vertical meaning) vertical with the axis direction of the axis 2 is pushed into the rotation of axis 2
Formula is movably accommodated in housing 1.One end of OT plungers 4 has to abut and what is pushed supports with the button 51 of switch portion 5
Socket part 41.In addition, OT plungers 4 are supported by bushing 7.In addition, OT plungers 4 have helical spring 42 in inside, have and absorb OT
Function.It is explained below for the detailed construction of the abutting part 41 of the OT plungers.
Switch portion 5 has the button 51 that pattern is switched to opening or closing, and is contained within the case 1.
In addition, such as hemispherical or fish plate as shown in FIG. 1 like that, button 51 is configured to convex.In addition, button 51
It is exerted a force by helical spring (not shown) to projected direction.
Next, illustrate the configuration example of the abutting part 41 of OT plungers 4 with reference to Fig. 1, Fig. 2A-Fig. 2 C.
As shown in Figure 1, Figure 2 shown in A- Fig. 2 C, the abutting parts 41 of OT plungers 4 axle center (meaning for including substantially axle center) have compared with
51 button of button of switch portion 5 and the smaller recess portion 411 of diameter.Such as shown in figures 2 a-c, which is configured to
The shapes such as cylinder hole, conical bore or hemispherical aperture.In fig. 1 it is shown that the situation of the recess portion 411 equipped with cylinder hole.
Next, it is illustrated for the action example of limit switch as constituted described above.
First, when rotating swingle using operating body, with the rotation, axis 2 is pivoted.Then, cam part 22
Direction changes due to the rotation of axis 2, overcomes helical spring 6 as a result, and pushes cup-shaped plunger 3, similarly, also pushes OT plungers
4.Then, since OT plungers 4 are pushed, abutting part 41 abuts with the button 51 of switch portion 5 and pushes the button 51, switch portion 5
It opens.
Further, since OT plungers 4 have the function of to absorb OT, therefore switch portion 5 can be damaged to avoid excessive pushing button 51
Situation.
On the other hand, when the rotation for swingle is released from, the rotation for axis 2 is also released from.Then, due to spiral shell
The active force of spring 6 is revolved, cup-shaped plunger 3 is reset to initial position, and due to the reset force, axis 2 is reset to initial position.
Then, by the way that axis 2 is reset to initial position, OT plungers 4 are released from from axis 2.Then, due to the active force of helical spring,
The button 51 of switch portion 5 is reset to initial position, and switch portion 5 is closed.Then, due to the reset force of button 51, OT plungers 4 reset
To initial position.
Here, as shown in figure 3, in limit switch, when axis 2 rotates, the cam part 22 of plate is to away from OT plungers 4
The position applied force F1 in axle center.Therefore, in this case, can rub between OT plungers 4 and bushing 7.
On the other hand, in the limit switch involved by embodiment 1, recess portion 411 is equipped in the abutting part 41 of OT plungers 4.Cause
This, since the recess portion 411 and button 51 abut, the moving direction of OT plungers 4 is limited, can reduce OT plungers 4 and bushing 7 it
Between friction.Hereinafter, the reasons why friction being reduced between OT plungers 4 and bushing 7 with reference to Fig. 3 explanations.
Hereinafter, OT plungers 4 are set to uniform motion.Further, since OT columns caused by gap between OT plungers 4 and bushing 7
The gradient of plug 4 is smaller, is ignored so being considered as.
Here, the power that OT plungers 4 are applied to by cam part 22 is set to F1.Also, compared with power F1, OT columns are applied to by button 51
The power of plug 4 is set to F2.Also, due to power F1, the power that OT plungers 4 are applied to by bushing 7 is set to F3 and F4.In this case, power F1
The balance of~F4 represents to following formula (1), (2).
F1=F2 (1)
F4=F3 (2)
Here, the distance from the axle center of OT plungers 4 until the position of applied force F1 is set to L1.Also, from OT plungers 4
Distance of the upper end until the peak that OT plungers 4 are abutted with bushing 7 is set to L3.In addition, from the upper end of OT plungers 4 to OT plungers
Distance until 4 minimum points abutted with bushing 7 is set to L4.In this case, the balance of torque is represented with following formula (3).
F1Ll+F3L3-F4L4=0 (3)
Also, it can draw following formula (4) according to these formula (1)~(3).
F4=F1L1/ (L4-L3) (4)
Here, when the recess portion 411 by being arranged in abutting part 41 is and when slightly limiting OT plungers 4, F4 is also dispersed in
51 side of button of switch portion 5 and reduce.Then, since frictional force is " coefficient of friction × F4 (F3) ", F4 rubs if reducing
Wiping power also reduces.
Fig. 4 A- Fig. 4 B are the figures for the effect for representing the limit switch involved by embodiments of the present invention 1.Fig. 4 A are represented
Frictional force in existing limit switch, Fig. 4 B are represented in the limit switch (situation of Fig. 2A) involved by embodiment 1
Frictional force.In Fig. 4 A- Fig. 4 B, transverse axis represents the position of OT plungers 4, and the longitudinal axis represents to apply to the power F4 of OT plungers 4.In addition,
Bold portion represents the power F4 in the button 51 in push switch portion 5, and dotted portion is represented when the button 51 of switch portion 5 resets
Power F4.Then, the width between the bold portion and dotted portion is bigger, represents that frictional force is bigger.
It understands as can be seen from figures 4a-b, the existing limit switch shown in compared with Fig. 4 A, 1 institute of embodiment shown in Fig. 4 B
One side of limit switch being related to can reduce frictional force.
As described above, according to the present embodiment 1, due to having following composition, possess：Switch portion 5, with button 51；
And OT plungers 4, there is the abutting part 41 for pushing button 51, abutting part 41 has on axle center compared with button 51 diameter
Smaller recess portion 411, therefore the abrasion of OT plungers 4 can be inhibited.
In addition, in above-mentioned, button of the OT plungers 4 for using and having the function of to absorb OT as push switch portion 5 is shown
The situation of 51 plunger.But it's not limited to that, can also use and be opened without the plunger 4b for absorbing OT functions as pushing
The plunger of the button 51 in pass portion 5.In fig. 5 it is shown that the limit switch of cam-type.
In the limit switch shown in Fig. 5, compared with limit switch shown in FIG. 1, cam part 22 is changed to cam part 22b,
Cup-shaped plunger 3 is changed to so that the torsion coil spring 8 that axis 2 is reset to initial position and exerts a force, OT plungers are changed to
State plunger 4b.Other compositions are identical with Fig. 1.
In addition, the present application in the range of invention, can carry out the deformation of the arbitrary inscape of embodiment,
Or the omission of the arbitrary inscape of embodiment.
Symbol description
1 housing
2 axis
3 cup-shaped plungers (reset plunger)
4 OT plungers
4b plungers
5 switch portions
6 helical springs
7 bushings
8 torsion coil spring
21 sawtooth portions
22nd, 22b cam parts
41 abutting parts
42 helical springs
51 buttons
411 recess portions.
Claims (4)
1. a kind of limit switch, which is characterized in that including：
Switch portion, with button；And
Plunger has the abutting part for pushing the button,
The abutting part has on axle center compared with the button the smaller recess portion of diameter.
2. limit switch according to claim 1, which is characterized in that including：
Axis, with cam part；And
Reset plunger is abutted with the cam part, is pushed into the rotation of the axis with the axis direction of the axis just
The direction of friendship, and exerted a force by helical spring to the cam part side,
The plunger has the function of to absorb the excess of stroke, and is abutted with the cam part, is pushed into the rotation of the axis
The direction orthogonal with the axis direction of the axis.
3. limit switch according to claim 1, which is characterized in that including：
Axis, with cam part；And
Torsion coil spring, so that the axis is reset to initial position and exerts a force,
The plunger is abutted with the cam part, is pushed into orthogonal with the axis direction of the axis with the rotation of the axis
Direction.
4. according to the limit switch described in any one in claim 1-3, which is characterized in that
The recess portion is cylinder hole.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2016-227812 | 2016-11-24 | ||
| JP2016227812A JP6839968B2 (en) | 2016-11-24 | 2016-11-24 | Limit switch |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108109871A true CN108109871A (en) | 2018-06-01 |
| CN108109871B CN108109871B (en) | 2019-12-13 |
Family
ID=62206523
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711143372.XA Active CN108109871B (en) | 2016-11-24 | 2017-11-17 | Limit switch |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP6839968B2 (en) |
| CN (1) | CN108109871B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7193693B2 (en) | 2020-09-11 | 2022-12-21 | 東洋製罐株式会社 | Dispensers and Unmanned Aerial Vehicles |
| CN113394031B (en) * | 2021-08-17 | 2021-10-15 | 江苏吉野电气有限公司 | Anti-collision travel switch |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1396611A (en) * | 2001-07-10 | 2003-02-12 | 欧姆龙株式会社 | Limit switch |
| JP2004247255A (en) * | 2003-02-17 | 2004-09-02 | Yamatake Corp | Limit switch |
| CN103441020A (en) * | 2013-08-14 | 2013-12-11 | 苏州华日金菱机械有限公司 | Microswitch |
| CN104517751A (en) * | 2013-10-04 | 2015-04-15 | 施耐德电器工业公司 | Limit switch |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3463131B2 (en) * | 1994-10-13 | 2003-11-05 | オムロン株式会社 | switch |
| JP2015082489A (en) * | 2013-10-24 | 2015-04-27 | オムロン株式会社 | Switch |
-
2016
- 2016-11-24 JP JP2016227812A patent/JP6839968B2/en active Active
-
2017
- 2017-11-17 CN CN201711143372.XA patent/CN108109871B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1396611A (en) * | 2001-07-10 | 2003-02-12 | 欧姆龙株式会社 | Limit switch |
| CN1658349A (en) * | 2001-07-10 | 2005-08-24 | 欧姆龙株式会社 | Limit switch |
| CN100372038C (en) * | 2001-07-10 | 2008-02-27 | 欧姆龙株式会社 | Limit switch |
| JP2004247255A (en) * | 2003-02-17 | 2004-09-02 | Yamatake Corp | Limit switch |
| CN103441020A (en) * | 2013-08-14 | 2013-12-11 | 苏州华日金菱机械有限公司 | Microswitch |
| CN104517751A (en) * | 2013-10-04 | 2015-04-15 | 施耐德电器工业公司 | Limit switch |
Also Published As
| Publication number | Publication date |
|---|---|
| JP6839968B2 (en) | 2021-03-10 |
| JP2018085239A (en) | 2018-05-31 |
| CN108109871B (en) | 2019-12-13 |
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| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |